Chair armrest



FIG. 1 is a perspective view from above and to one side of a variant of the new design for a chair armrest;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a chair armrest, as shown and described. 